掺合料复掺对水泥基材料孔溶液碱度的影响

通过测定低水胶比下复掺粉煤灰、矿渣、硅灰的水泥基复合体系孔溶液PH值，研究孔隙液碱度随矿物掺合料的种类、掺量、不同复配情况的变化规律和碱度变化的原因。结果表明，复掺粉煤灰、矿渣（或同时掺硅灰）的多组分水泥基体系各龄期孔隙液的PH值均低于纯水泥净浆；粉煤灰和矿渣等双掺的水泥基体系，总掺量小于等于40％时，随掺量增加，同龄期的孔隙液PH值降低，其主要原因是稀释效应和化学效应；总掺量相同，掺合料复掺方式不同的试样其碱度不尽相同。

Influence of compound mineral admixtures on alkalinity of cement-based material pore solution

Influence of different added content and compound mode of compound mineral admixtures with two components and three components on alkalinity of cement-based material pore solution were studied, and their mechanisms of action were analyzed.Test results showed that the alkalinity of cement-based material pore solution added with fly ash,slag(or added with silica fume at the same time) is lower than that of pure cement paste pore solution at the same age.In this experiment,the same content addition of fly ash and slag(the total content of fly ash and slag is nor higher than 40%)lower the alkalinity of its pore solution,and the higher the added content,the lower the alkalinity,and the main reason is the effect of dilution and pozzolanic reaction of mineral admixture.Different compound modes of different added content of compound mineral admixture have different influence on the talkalinity of cement-based material.